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Update releases/release-7.4.0.md
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hfxsd authored Oct 11, 2023
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Expand Up @@ -117,7 +117,7 @@ TiDB 版本:7.4.0

更多信息,请参考[用户文档](/tidb-global-sort.md)

* 优化 Parallel Multi Schema Change,提升一个 SQL 语句添加多个索引的性能 [#41602](https://github.com/pingcap/tidb/issues/41602) @[tangenta] (https://github.com/tangenta) @[Defined2014](https://github.com/Defined2014)
* 优化 Parallel Multi Schema Change,提升一个 SQL 语句添加多个索引的性能 [#41602](https://github.com/pingcap/tidb/issues/41602) @[tangenta](https://github.com/tangenta) @[Defined2014](https://github.com/Defined2014)

在 v7.4.0 之前,用户使用 Parallel Multi Schema Change 在一个 SQL 语句中提交多个 `ADD INDEX` 操作时,其性能与使用多个独立的 SQL 语句进行 `ADD INDEX` 操作的性能相同。经过 v7.4.0 的优化后,在一个 SQL 语句中添加多个索引的性能得到了大幅提升。

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